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Time for another try at a Znter rechargeable LiPo battery with USB port for charging in the form of a 9V 400 mAh battery as an alternative to traditional 8.4V NiMH or 9V Alkaline battery. With our initial bad experience with the 1500 mAh Znter ZNT18650 that came dead and after opening it up we were not that happy with the build. The 9V rechargeable battery from Znter however looked much more interesting as it actually comes with higher advertised capacity than pretty much all 8.4V NiMHs and falls a little short in capacity compared to the best 9V alkaline batteries in terms of mAh. It is most likely a single cell LiPo battery with a step up voltage converter to output 9V in the size of a standard 9V alkaline battery. Fortunately the 9V 400 mAh Znter battery we got was what it was supposed to be and not with a dead LiPo cell inside, so we headed to testing its capacity…

Doing our regular 0.05A test we use for the 9V Alkaline and 8.4V NiMH batteries we got 338 mAh out of the rated as 400 mAh Znter battery, a really good result compared to 8.4V NiMHs we have tested so far. That result is also on par with an average performing 9V alkaline battery, but the Znter can be recharged and reused via a standard USB, so it is much more convenient. Things however get even more interesting when we look at the voltage curve during the discharge tests as it is essentially flat up until the end of the available capacity and we do not normally see this with NiMH or Alkaline batteries, it is the expected behavior for power banks however. The pretty stable at 9.51V output during the whole discharge test means much higher capacity in Wh compared to traditional batteries with the same mAh results where the voltage is dropping during the cycle. As a result we can say that we are quite happy with this particular product from Znter and it can be a really good alternative to traditional 9V Alkaline and 8.4V NiMH batteries.

The performance of the 9V 400 mAh Znter USB Rechargeable LiPo Batteries in our tests:

– 338 mAh at 0.05A load

– 3.212 Wh at 0.05A load